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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. The problem is easily fixable by using a simple DIY solution. The rollers are made from stainless steel and are resistant to breaking. They are simple to install using the supplied hardware. They also bear loads and designed for smooth operation. Nylon Wheel Nylon is a thermoplastic material with outstanding mechanical properties. It can withstand heavy loads and even some impac